How to extrude faces inward and outward sphere together
Use &quot;separate objects&quot; when in edit mode and you have the window panes selected. Put them in a separate grouping. Then tab out of edit mode, use solidify on the frame, and not on the panes group.  Parent the panes to the frame for scale adjustments as &quot;parent object&quot; in object mode, select panes-object first, shift+click frame and apply parenting (right click or menu etc).  The panes will have the thin non-solidified thickness and the frame will still have a solidify you apply, adjust as required.